Thieme



Apri] 20, 1937. o. THIEME COMBINED TYPEWBITING AND COMPUTING MACHINEFiled Aug. 29, 1929 8 Sheets-Sheet 1 www E ma N wm' u T N M m mmm JW, M

April 2o, 1937. o. THIEME v2,077,862

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Aug. 29, 1929 8Sheets-Sheet 2 ATTORN April 20, 1937. o. THIEME 2,077,862

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April 20, 1937. Q- THIEME 2,077,862

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April 2o, 1937. o. THEME 2,077,862

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Aug. 29, 1929 BSheets-Sheet 6 VLM L67 mvENToR I @mi J BY M 4 ATT-C April 20, 1937. o.THIEME COMBINED TYPEWRITING AND COMPUTING MACHINE B Sheets-Sheet T FiledAug. 29, 1929 mvsNTo:

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ACOMBINED TYPEWRITING AND COMPUTING MACHINE Filed Aug. 29, 1929 8Sheets-Sheet 8 Patented pr. 20, Y 1937 UNITED STATES PATENT OFFICE OttoThieme, Hartford, Conn., assigner, by mesne assignments, to UnderwoodElliott Fisher Company, New York, N. Y.,

Ware

a corporation of Dela- Applicaton August 29, 1929, Serial No. 339,152

13 Ciaims.

This invention relates to combined typewriting and computing machines ofthe Underwood-Han: s son class, and discloses a. power-operated portableor desk-machine, as distinguished from the machine heretofore mountedupon a truck to be wheeledfrom place to place for manipulation.

Certain characteristics of the present invention may be regarded asimprovements on the structure disclosed in the pending application ofHenry L.' Pitman filed June 2, 1926, Serial No. 113,133, (now Patent No.1,827,298, dated October 13, 1931) and these improvements consist mainlyin reducing certain parts of the Pitman'mechanism to manufacturable formfor quantity production, and the grouping of co-operating parts, aspre-assembled stock-units.-

Some of the novel features include a motorunit that can be applied to ahand-operated computing machine already in use, to convert the lmachineinto a power-driven mechanism; a motor-unit compactly mounted upon therear of the .machine-frame, with reduction gearing and a clutch having adirect driving connection with the general operator, and effectivewithout increasing thetheight of the machine and Without spreading theparallel trains of registering mechanisms of the standard two-registermachine, for driving the'l connections to the general operator; acomputing base-frame having punched-out mechanism-supporting andmechanism-enclosing sheet-metal side plates to supersede theusuallacquered cast plates that requirespecial protection to preventinjury during the assembly of the computing mechanisms and during thestorage of the fully-assembled computing base as a stock-unit; theunfinished sides of the' computing base, after it is completelyassembled in the typeWriting-machine frame, being enclosed by die-formedhighly polished thin sheet-metal plates, as a iinal assembly operationfor the combined machine; a simplified means for rendering thetransposition levers ineffective to advance the pin-bars 4seriatim topin-setting positions, and thereby silencing the pin-setting function ofthe numeral-keys in typing; a transposition mechanism pre-assembled andpre-adjusted to forma finished stock-unit contained within an attachableframe, that includes an aligning and supporting comb for the 'pin-bars,and also shiftable fulcrum-rod connections for the series oftransposition levers, the fulcrum-rod of said series of levers beingshiftable to a position where the denomination-selecting push-rods willhe ineffective to shift the pin-bars to pin-setting posi-'- tion; an4improved column-stop provided with (c1. zas-so) means reinforcing thesubtraction-setting member of the stop, to check the rocking of the stopupon the stop-bar, While operating the train of depressiblesubtraction-setting mechanism; an improved mechanism effective to lockthe numeral-keys in certain zones, and during the automatic return ofthe carriage andthe tabulation of the carriage; connections with thenon-compute key automatically effective to silence the transpositionmechanism and simultaneously release the locked numeral-keys for typingonly; improved means for locking the subtraction-key while the error-keyis effective; improved means for locking the error-key While thesubtraction-key is depressed; and improved means for locking thenumeral-keys when the error-key is depressed, and simultaneously lockthe subtraction-key.

Other features include an improved method of transmitting astraight-line thrust from tappetoperated verticalplunger-pins to tvvolaterally separated transposition mechanisms, by the employment of novellight, long, two-part denomination-rods,y each eiective to transmit therequired lateral or angular thrust Without cranking or buckling effect;and the provision of four separate assembled units, a typewritingmechanism, a computing mechanism, amotor-driving mechanism and aan-foldweb and carbon-feeding mechanism, all four mechanisms combined toform a compact machine-unit; and also sockets provided for the motor andcarriage frames, to receive rods or strutsto support the fan-fold webtracks over the motor-mechanism.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a vertical section, fore and aft of the machine, showing atypewriting machine, with motor-driven computing mechanism.

Figure 2 is a vertical section through the denominational stop-frame,showing a novel co1- umn-,stop adjusted to the carriage rack-bar andhaving stop-means engageable by the denomiunational stops, and atappet-means selectively operable to operate the thrust-bars andtransposition levers.

Figure 3 is a skeleton perspective view, showing the two spaced-apartsets of transposition levers, each set connected by a group ofthrustrods, the groups converging to a central computing zone for bothregisters.

Figure f1 is an enlarged perspective View of portions of the generaloperator, showing a crossbar having a pitman-connection to the motor.'

Figure 5 is a detail construction of the pivotal pitman-connection tothe cross-bar of Figure 4.

Figure 6 is a detail, in perspective, showing a connection between thecarriage-returning mech- 5 anism andthe numeral-key-locking means.

Figure 7 is an enlarged perspective view with parts of the computingmeans broken away to disclose the registering mechanism and the controlof the register-wheel detents, to determine 1o the state of thenumeral-wheels by an interlock with the star-key.

Figure -8 is a perspective view of some of the computing mechanism,including the subtractionkey, the error-key and motor-starting key andl5 connections.

Figure 9 is a plan view of a. two-way shuttle interlock between theerror-key and the motorstarting key to avoid simultaneous depression ofthese keys.

20 Figure 10 is a diagrammatic view, showing the operating handle on itsforward stroke and the means effective to prevent the depression of theerror-key.

Figure 11 is a sectional view through one of 25 the machine-supportingmetal f eet of the type- Writing machine, the hardened lugs on thecomputing-machine base upon which the feet rest, and the tapered lockingpins that removably secure the feet in position to lock the typewriting-30 machine base to the computing-machine base.

Figure 12 shows a carriage-return clutch in interlock, and the meansvibrated by the pinionshaft operative to lift a train of mechanism andlock the keys until the carriage-return move- 35 ment is completed.

Figure 13 shows the parts of Figure l1 in lifted or key-lockingposition.

Figure 14 is a fragmentary perspective view of the carriage-releasinguniversal bar and connections that are rendered effective when atabulating key is depressed.

Figure 15 is a plan view of the special columnstop adjustable upon thecarriage-stop bar, showing the means for reinforcing the usual sub- 45traction-setting extension.

Figures 16 and 17 illustrate the detenting assemblage for theregister-wheels, and the condition of the star-key when the wheels arenot cleared to zero.

Figure 18 is a fragmentary front view of the pin-setting frame, showingthe locking interponent that fills up the working gap between the seriesof interlocking pendants and the novel means for controlling theinterponent.

Figure 19 shows the general operator moved forwardly, which causes thesilencing of the transposition levers and locks the numeral-keys untilthe return cycle of the generall operator restores these parts to normalposition.

Figure 20 shows the non-compute mechanism and the novel way of releasingthe locked numeral-keys, to and the connections for silencing thetransposition levers to the pin-bars.

Figure 21 is an inverted plan view of the motor-unit including themotor-driven parts and anisms forming a compact machine-unit that restsupon a table.

Figure 25 is a plan view, showing the detaily structure of thecomputing-machine base.

In Figure 1 of the drawings, alphabet-keys 25 and numeral keys 26 swinglevers 21 about a fulcrum-wire 28 and against a compression spring 29,to vibrate a bell-crank 30 about a rod 3|, to swing a type-bar 32 abouta segment-wire 33 upwardly and rearwardly to strike a platen 34. Theplaten may be supported by a platen-shaft 35 having bearings in eachcarriage-end 36, and may be provided with the usual line-spacing andpaper-feeding devices, not shown. A carriage 31 includes a rectangularframe mounted to ride upon rails 36 under the tension of acarriagemotor, not shown. To feed the carriage in letterspacing, theusual carriage-feed-rack 39 is in train with a pinion 40 that iscontrolled byan escapement-mechanism, not shown, but which may beoperated by a universal bar 4I vlbrated by each type-bar in typing, inthe well-known Underwood manner.

'I'he carriage also has a tab lating mechanism including a rack-bar 42supported by brackets 43 at the rear of each carriage-end 36, to receivecolumn-stops adjustably assembled therealong. The usual denominationaltabulator-keys 45 at the front of the keyboarddepress levers 46, to liftvertically-disposed denominational stops 41 and project the upper freeends thereof into the path of an advancing carriage-stop 44. Each stop41 has a notch 48, Figure. 14, to` engage a universal bar 49 to rock ashaft 50 when any stop 41 is lifted, to operate a crank-arm 5|, torelease the carriage-rack from the escapement-pinion, as shown in thepatent to Roberts, 1,066,224, dated July l, 1913.

The carriage is provided with a motor-driven carriage-return mechanism,in many aspects disclosed in the patent to Henry L. Pitman, 1,580,- 326,dated April 13, 1926. A carriage-return key 52 is connected to an arm 53of a bell-crank pivoted upon a stationary stud 54, formed with anupright arm' 55 and provided with a spring. `The arm 55 may be a, triparm operative to swing under a tripping cam 56, Figure 12, fixed to theforward end of a bar 51 formed with a notch 51n to engage the bottom ofa slot in the key-lever front comb 51. The rear end of the bar 51 ispivotally suspended from the end of an arm 58 fixed to a shaft 59,carrying a crank-arm 60 connected by a link 6| to an arm 62 dependingfrom a shaft 63, having a second arm 64 connected by aforwardly-extending bar 65 which communicates by a link 66 to the end ofan arm 61 secured to a rock-shaft 63.

The shaft 63 has an operating arm 63 provided with an anti-frictionball-terminal 10 operative between flanges 1| of a pinion 12 slidableupon a shaft 13 and at all times in tooth engagement with a rack 14secured to the carriage 31. The pinion 12 is formed with clutch-teeth 15shiftable with the pinion to engage with the teeth of a clutch-head 16fixed to the shaft 13 and rotated by a pulley 11 connected to a. novelsource of power to be described.

Depression of the key 52 trips the cam 56 to raise the front end of thebar 51, to lift the notch 51IIL freeoi' the comb-plate 51b to respond tothe tension of a spring 18 to rock the shafts 59, 63, and 68, and shiftthe pinion 12 into clutching engagement with the head 16, to return thecarriage when ,power is transmitted to the pulley 11. The rocking of theshaft 59 rocks an arm 19 to push a bar 80, communicat- `ing with amake-and-break switch-arm 8|,

'shown at Figure 21,rthat closes a plugged-in circuit to a motor 82,which drives a belt 83 connected to the pulley 11 to drive the returningpinion 12.

A trip on the carriage, similar to that disclosed in the patent toFrederick A. Hart, 1,238,908, dated September 4, 1911, operates to rockthe shaft 68 in a clockwise direction to eifect the release of thepinion 12` from the rotating clutchhead 16, withdraw the bar 80 and theswitcharm 8| to open the motor-circuit and at the same time shift thebar 51 forwardly to reengage the bar-holding notch 51a with the comb51".

Instead of a manual carriage-return control as by the key 52, saidpatent to Hart also discloses a margi'nal stop-control at the line-endposition of the carriage vwhich eifects the depression of a verticallinkv 82H-, to swing a lever 83a to engage a stud 84 on the bar 51 andlift the notch 512iL out of the comb-slot and free the bar andconnections to the spring 18 to effect the returnof the carriageindependently of the key 52. i

Figure 14 shows means for preventing the depression of thecarriage-return key 52 while any tabulator-key is depresse-d. The shaft50 has an arm 85 to interfere with the rearward sliding movement of thebar 80 and prevent closing of the switch-arm 8| to start the motor. Thedepression of any tabulator-key45 is also prevented during thedepression of the carriagereturn key, the bar 80 passing over the end ofthe arm '85 to prevent the lifting of said arm and arrest the movement`of the universal bar 49 by any stop 41, all as more fully described inthe pending application of Adolph G. -Kupetz, led October 10, 1924,Serial No. 142,135 (now Patent No. 1,807,626, dated June 2, 1931).

The column-stop shown in Figure 2 is an irnprovement on the stop shownin my Patent No. 1,649,329, dated November 15, 1921, where the stop hasteeth 86 that enter slots cut in the under face of the bar 42, and issupported by a spring-pressed clip 81 that. is formed with stop-holdingand stop-positioning detents 88. The stop is further formed with adepending lip 99 to be engaged by the tabulator-'stops 41. Thetabul'ator stop-frame 90 includes a horizontal plate-extension 9|,t`heend of which supports an L-shaped bracket 92 that includes a horizontal'Ahousing section 93 paralleling the extension 9|.

The rear end of the stop 44 carries an antifriction roller 94 whichrolls against the under face of the section 93 to prevent the stop frombeing cammed upward in passing over upright selecting devices, to bedescribed. To further reinforce the stop and maintain its alignment, thestop may be providedfwith a ratchet-shaped tooth 95, Figures 2 and 3, tointerlock with the ratchet-teeth of a universal bar 96. The latter hasbent-over end-'arms 91 having screws or pivot supports 98 for the endsof the rack 42. A scale-plate 99 is held above the bar 42, by which thestops 44 may be set from a reading at the platen-scale.r Aspring pressesthe bar 96 into engagement with the tooth 95 of each stop 44 adjustedupon the rack 42.

Heretofore, the Underwood-Hanson computing-machine base-frame,.uponwhich the typewriter is 'assembled for co-operation, included cast ironplates, pre-machined and highly lacquered before the assembly of theparts, and

these surfaces had to be carefully protected from mars and scratchesduring the subsequent handling and the assembling of the manycomplicated parts. The assembly of all the parts within they enclosingcast iron plates presents diflicult problems, especially forreadjustments, and such shafts, screws, etc., that penetrate thepolished side plates, required much costly nickel work.

The present structure includes the substitution of thin cold-rolled,punched-out, steel plates and |02. These plates in their original stateare smooth, polished and of uniform thickness, and all clearance-slotsand holes to, be threaded may be pierced by the punching operation.

Referring to Figure 25 in particular, the two plates 10| and |02 areeach provided at the front end with a stiffening bar |03 permanentlysecured to the inner face of the plates. A front `cover-plate |04 may besecured by screws |05 threaded into said bars.

The rear ends of the plates 10.1 and |02 are also supplied vwith bars|06, to which feet |01 of a motor-supporting frame or casing |08 may besecured, to tie `the two rear ends of the plates together and completethe computing base.

To further stabilize this sheet-metal frame, there are provided aregister-supporting crossbar |09 and a transposition linkage-supportingbar 110, both bars secured between the two plates 10| and |02 by meansof screws threaded from the outside of the plates.

Thin japanned side plates 112 form the outer shell of the computingsection and cover the machine-supporting side plates 10|, |02. The sideplates 112 are secured to the plates 10| and |02 by screws |13 threadedVinto spacing studs |14 rigidly mounted on the plates |01, |02. In thismanner, there is provided a working space at each side of the base-framebetween the plates 101 and |02 and the side plates |12, where unnishedscrew-heads, springs and ilat steel linkages and other connectingmechanism may be exposed and be readily accessible for adjustmentsuponthe removal of the cover-plates |12.

The computing base may also include a sunken top plate or floor |15secured to suitable blocks 116 on said plates 10| and |02 to support theconfined subtraction-key mechanism |11 and elimination-key mechanism|18.

Theside plates 10| and |02 are further provided with permanentfelt-protected feet |19 formed by a screw-machine operation into abellshaped unit with ka boss-section A|20 at one end;

and the other end counterbored for a rubber pad 12| and drilled andtapped-for a pad-retaining screw. The boss-section |20 isstraddle-milled to form an integral central tongue |20a and also to forma seat for the edge of the plates, and the tongue may be positionedagainst the side plates |01 and |02 and riveted thereto at |22. Fourfeet 1,1 9 may be assembled to the side plates in the manner described,and a special foot |19EL that supports the motor-frame 08 may beattached vby a -foot-holding screw |23 threaded into the upon a hardenedblock |28 secured to the upper face of the top plate I I5, see Figure 3.

The typewriting-machine base does not rest upon the top edges of the twoside plates 0| and |02, but the hardened feet |25 rest upon the hardenedblocks |28 to support the weight of the machine. The typewriting machineis secured to the computing base, after setting the .feet |25 upon the`blocks |28 and within the grooves |26 in the side plates. For thispurpose each foot may include an annular groove |29, see Figure ll, anda clamping screw |30 may be threaded through the side plate and formedwith a conical head |3| which may be drawn into the annular groove of afoot, to lock it and prevent upward displacement of the feet from theblocks |28. The screw |30 may have a lock-nut |32.

From the description of this built-up computing-base section it will beunderstood that the frame may pass through the mauling stages ofbench-assembly and require no cumbersome wrappings to protect finishedsurfaces, and that at the final assembly of all the computing mechanismstherewithin, the base becomes a unit that can be stored on shelves as astock-product requiring no particular protection from injury bysurface-contact.

It will also be noted that the computing' base may be fully assembledbefore the motor and its casing are attached, thus relieving theassemblers of the labor of shifting this added motor-weight during themany assembly-operations, and that the surface-finished motor-casing maybe the final addition to the unit.

The motor-supporting ,casing |08 converges rearwardly from the positionof the side feet |01, secured to each end ofthe side plates |0| and|532, to a point midway between the two plates, giving a centralposition to the motor 82; and its driving transmission extends forwardlythrough the longitudinal center .of the base and between the tworegistering mechanisms of the computing mechanism.

The side wall of the motor-casing merges with a short, hollow pedestal|33 to support a flange |34. of the vertically-disposed motor 82 thatmay be secured by screws |35. The free end of motorshait |35 takes anend bearing in a horizontal wall |31 at a point between a pedestal-space|38 and a space |39 in the casing |08. The motor- ,shaft carries a worm|40, eiective to drive a worm-gear |4| secured to a horizontal shaft|42, having bearings in the side walls of the pedestal |33; and theexposed forward end of said shaft |42 is provided with a driving pulley|43 which communicates power by the belt 83 to the pulley 11.

Each numeral-key 26 has a pendant |44 which when depressed engages acrank-arm |45 to rock a shaft |46, that moves a pin-setting bar |41 todepress one of a series of index-pins |48 in a pinbar |49; there beingone bar for each registerwheel |50.

The column-stop 44 is formed with a tappet 5| to engage the upper endsof thrust-rodsy |52 as the carriage letter-spaces the tappet step bystep through a computing zone. Each thrust-rod |52 has its lower endthreaded into a clevis |53 pivotally secured to the outer end of a',lever |54, and the series of levers may be fulcrumed upon a rod |55having end-bearings in brackets |55a .in the cross-bar 0. The inner endsof the levers |54 engage arms |56 of transposing levers |51, nestedtogether upon a fulcrum-rod |92 toV reverse the denominational orderfrom the rods |52 to the pin-bars |49, through an arm |58 engaging astud-pin |59 in each bar. The pin-bars |49 are shifted longitudinallyseriatim under the pin-setting bars |41 as the tappet |5| depresses rods|52. Spring |6| restores the bar when released, and brings aille-spotted face |62 into Contact with the face of a bar-supportingcombplate |63, forming a, part of a frame secured to the cross-bar ||0,said frame in turn supporting a second comb |65, that spaces the levers|54 and the arms |56 of the transposing levers.

The index-pins are projected into the path of a cross-bar |66 of ageneral operator, that includes a rack |61, which may be driven by asector |68 through an intermediate pinion |69; the bar |66 picking upthe depressed pins and shifting their bars |49 forwardly to rotateregister-Wheels |50.

Each wheel |50 may be held by the round nose of a detent-lever 235engaging depressions or notches formed at the side of eachregister-wheel.

The return stroke of the bar |49 idly rotates a pinion through the usualpawl-and-ratchet individual to each number-wheel, not shown. Thereturn-stroke of the general operator effects the restoration of theparts, and the usual pin-restoring platform |1| is.lifted by an arm |12secured to a shaft |13, provided with a second arm |13 carrying a studto be engaged by one arm |14 of a bell-crank mounted upon a shaft |15and having a second arm |16 that carries a roller |11 to be engaged by acam |18 fixed upon a shaft |18 that is rocka'ble by the usual operatinglever |80 to raise the platform |1| to restore the set-up pins |48.

In the Pitman application, the sets of denominational thrust-rodsdiverge downwardly from the carriage, so that the vertical thrustsreceived at the tops of the rods may eifect vertical thrusts at thewidely separated sets of transposition levers. This construction o f therods tends to create a cranking action that incurs liability of bucklingof the light thrust-rods.

The present invention includes two parallel trains of registeringelements A and B, selectively cperated by individual series oftransposition levers |54, assembled upon a standard two-register base,there being suiiicient working space between the trains to accommodateelements of the general operator; and each series of levers is fconnected with a series of inclined thrust-rods. The thrust of each rodis diagonal, as determined by a straight line intersecting the point oftranslation at the top of the rod and the point of transmission at thebottom of the rod. 'Ihe levers |54 in each set may diverge rearwardly,and each lever maybe twisted to align with its rod, and each clevis |53may have a straight threaded connection to its rod. The upper ends ofthe rods |52 instead of contacting directly with the tappet |5| areprovided with motion-translating intermediaries in the form of verticalpins that are engageable by the tappet |5|.

The plate 9'|, Figure 2, supp'orts an under parallel plate |8| separatedby Washers |82 and secured by screws |83. The plate 9| is drilled withtwo or more series of vertical guide holes |84 for pins |85. The pinsare at letter-space intervals.

The loose tting round-nosed pins or plungers |85 are assembled in theholes |84 from the under side of the plate 9|, and project upwardly, asuitable head on each pin engaging the under face of said plate. Thethrust-rod-holes in the In this manner little carriage-driving power` isconsumed causing the tappet to ride over and across a pin |85, and thetransmission of motion from a vertically-movable pin-head to itsobliquely-thrustable rods |52 is accomplished without waste. 'I'heindividual adjustability of each clevis to its rod makes it feasible topresent the upper end of the rod against the head of the pins andnormally hold said heads against the plate 9|, and may if desired placethe rods under a slight tension and take up any slack in theconnections.

The present invention employs a simple silencing means, for bodilyshifting back out of use the fulcrum-rod upon which the transpositionlevers are mounted. The rods, |52 are thereby rendered ineffective toactuate the studs H59 of the pin-bars |49.

To this end, at Figure 3, each nest of transposition levers is assembledas a stock unit within a frame |86 secured by screws to the cross-bar|09 of the base-frame. The frame H88 includes the vertical comb-plate|63 that supports the rear ends of the pin-bars, and two vertical sidearms |81 that provide bearings for a rockable shaft |88. To one end ofKthe shaft |88 a bellcrank may be secured, having two arms H89 and |90,the arm |89 formed with a slot Isl to engage the shouldered down end ofa fulcruin-rod E92 that rides in a slot |93 in each arm Q81.

The opposite end of the shaft E88 may have secured thereto a slotted arm|891@ and forming a part of a three-arm bell-crank having other arms |94and |95. The arm |89E engages the adjacent end of the fulcrum-rod 92supported by the slots |93 in each arm |81, and thereby suspends thelseries of transposition levers |58.

When the shaft |08 is rocked by mechanism to be described, thefulcrum-rod |92 will move rearwardlyalong the slots |93, and the uprightarms |58 of the transposition levers will draw away from the studs |59of the pin-bars; and the subsequent rocking of these arms by thecarriage will fail to operate the studs |59,4 and the numeral-key willbecome ineffective for pin-setting. This description will apply toeither transposition group A or B.

There are lseparate assembly units for the transposition mechanism, Yand the individual rock-shafts |88 are coupled for a unitary movement,from connections that lead to only one of said units. This couplingincludes a crank H96 xed to the inner end of the shaft |88`of the groupA and provided with a stud |91 to passv through a slot |98 in an arm |99secured to the inner end of the shaft |88 of the group B. When the arm|90 is rocked to silence the transposition devices of group A, thismotion will be transmitted to the other shaft |88I to silence the groupB.

One means for jointly silencing the transposition devices includes a lnon-compute key 200, shown at Figure 20, where the key -has been drawnforwardly to rock about a fulcrum-rod 20l to rock the lower arm 202thereof rearwardly. Through a pin-and-slot connection 203 bar 288 ispushed rearwardly, and a side stud 205 vibra-tes an arm 206 fulcrumedupon a stud 201 to nex a restoring spring 208. The bar 204 has a slidingmovement through a supporting stud 2l9 on the top plate I5, Iwith theforward end at 203 pivotally supported. by a link |181 having aspringpressed pin-and-slot connection |855* with an arm |64 looselymounted upon the shaft |19. The arm 206 has a one-way connection to alever 209 through a bent-over ear 2 I0, to vibrate the lower end of saidlever and rock the arm |90, to rock the shaft |88 and silence thetransposition devices.

The bar 204 has a detenting notch 2|| engageable with a slotted bracket2|2, to hold the bar against the tension of the spring 208, until thegeneral operator rotates the shaft |19 and the cam |18 to cause the link|18a to` lift the end of the bar 204 and release its notch 2|| frominterlock with the bracket 2|2; and a second notch 2|3 on the releasedbar will engage the bracket, this being the normal position of the bar204. 1

The rocking of the shaft |88 by the non-compute key rocks an arm |94 xedthereto, to engage an arm 2|5 of a bell-crank 2|8 fulcrumed upon across-rod 2|1, having a second arm 2|8 engageable with an arm 2|9lfulcrumed upon the rod 261 and connected to one end of a link 220. Thelink 220 is pivoted to the free end of an arm 22l, secured to arock-shaft 222 to rock the shaft when the non-compute key is shifted tothe Figure 20 position. Upon the shaft222 there is loosely held by apin-and-slot connection 223 and a spring 224 an interponent 225,arranged to be moved into the working gap between a series of pendentkey-locking dogs 226, to prevent the .depression of any numeral-keywhile the noncompute key is being moved to its effective position.

But as it is not desired to lock'the numeral keys during the intervalthe non-compute key is held locked to silence the transposition levers,means are'provided to unlock said keys so that numerals may be typed andnot computed. To

this end, the bar 208 has a side projecting stud 221 to engage abell-crank arm 228 fulcrumed upon the pin-setting frame 23| to depress asecond arm 228 to depress a slide 230 mounted upon the front face of theframe 23| for a free vertical movement upon a stud 232, see Figure 18.The slide 230 engages the interponent 225 to swing it downward to theposition of 'Figure 18 while the spring 224 is flexed and the shaft 222remains stationary. The withdrawal of the interponent 225 permits theextreme end dog 226 to abut the xed stud 232 and create a working gap inthe series of dogs 226 for the passage of any key-stem M48 to type.

Thus during the interval the non-compute key remains locked, theaccidental operation of any of the several connections to the rock-shaft222 will rock the shaft in the usual way, but said shaft will beineffective to raise the interponent 225 to lill up the stem-clearancegap in the series of dogs 228.

The present improvement includes a star-key locking mechanism having theusual universal bar set by the detent-levers to a position where nomovement of said bar will take place after its rst movement, because ofits latched condition, and all subsequent accumulating operations of theregister-wheels will only operate the detent-levers, to preserve thealignment of the wheels.

To this end, the two side frames 238, Figure 7, of each register have afulcrurn-rod 234 upon which there are mounted detent-levers 235, eachlever having an individual spring 238 to press the round nose 281ithereof into engagement with the round-nose wheel 228 forming a part ofeach registerwhee1 itt. Each datent is formed with a short arm to engagea universal bar 240 formed as a detent-straddling bail with two arms 24|loosely mounted on the projecting ends of the rod 234 and spring-pressedagainst the arms 239 of the detents by a suitable spring 242 connectedto each arm 24|. Each wheel 238 has a special depression or notch 238between two adjoining teeth where the round nose 231 of its detent-leverwill have a greater drop than when entering the other depressions. Thisspecial detenting position corresponds with the zero on the wheels atthe sight opening of the register.

The rotation of any register-wheel from its zero positilon drives itsdetent-levers against the universal bar 240 to move the latter, andthrough studs 243, each arm 24| moves one of two frames 244a and 244D,each frame including two arms 244 and 245 joined together by a sleeve246 mounted to rock upon a rod 241 supported at each end by brackets 248secured to the frame.

Each outer arm 245 has a spring 249. To check the frame 244a or 244bfrom pressing against the studs 243, each arm 244 carries a projectinglug 250 secured at the side thereof, `to engage in a notch 25| in theend of a latch 252. 'Ihe latch is pivoted upon a stud 253, and arrangedto drop behind its lug 250 when the frame is fully operated by anydetent 235, in being forced out of the notch 238e, as shown at Figure16, to lock frame 244L or 244b in its set position. In this way acomparatively strong 4spring 249 may be flexed to set the frames 244aLand 244, but only a light spring-tension 242 holds the universal baragainst the detents 235, thus minimizing the work of theregister-driving pin-bar.

The upper end of one arm 244 is connected by v a link 254 to one end ofa lever 255, fulcrumed to the under face of the top plate ||5, with theopposite end 256 formed to dog within sawtoothed notches 251 of avertically-disposedv plunger 258, pendent from a star-key lever 259associated with the register A, and depressible by the key to passthrough a guiding bushing 269.

In a similar manner the locking of the frame 244b for the register Bswings the lever 26| to engage notches 251 in the plunger 262 connectedto the key-lever` 263 of the star-key associated with the register B.When the several parts are set by the operation of any detent 235 to thepositions shown at Figure 1'7, the rocking of the frame 244b has shiftedthe lever 26|, so that its dogging end will enter a locking notch 251 ofa plunger 262 connected to a star-key-lever, 263 where it remains untilthe Wheels 238 have been cleared.

At -Figure 1 the register-wheels all register zero, the latches 252 havereleased the lugs 259, and both frames 244a and 244b have responded totheir springs 249 and both levers 255 and 26| have been vibrated torelease both star-key levers .259 and 263, all made possible through thedetents 235 entering the special deep depression 238a in each wheel 238of both registers A and B.

From this zero or clear position, the accumulation of the first digit ofany wheel |50 forces the detent to ride out of the deep depression 238'lto the highest point of the adjoining tooth of the wheel 238, as shownat Figure 16, where the stud 243 has moved the frame 244n to shift thelug 250 thereon in front of the notch 25| in the end of the latch 252 tobe engaged thereby, when the active detent 235 rides into the adjoiningsha1- low depression in the wheel 238, when the several parts willassume the positions'of Figure 17 and the frame 244a is latched, thelever 255 locks the key 259 and the stud 243 almost strikes the end of abell-crank arm 264 fulcrumed upon the stud 253. This bell-crank has asecond arm 265, carrying a pin 266 engageable Within a slot 261 in anarm 268 fulcrumed at 269 to the side frame 233, and formed with a secondslot 210, to engage a pin 21| on a short arm 212 of the latch 252. Thischain of links, under tension of a single spring 213 connected to thearm 265, secures the interlock between the latch 252 and the lug 250.

At Figure 17 it will be noted that the movement of the bar 240 by adetent 235 moves the stud 243 to give a clearance space between the arm264 and the stud, so that the stud 243 will not be moved by said arm264.

In clearing the wheels |50 from 9 to 0", the detents 235 will ride fromthe highest point of a tooth of the wheels 238 into the specialdepression 238a as the zero position of the wheels, and the spring 242will move the bar 240 towards the register-wheels, and the stud 243 willengage the arm 264 to rock the arm 268 to move the arm 212 and lift thelatch 252 clear of the lug 250 and free the associated frame as 244n tothe flexed spring 249, and release the locked star-key lever 259,provided all the rest of the wheels |58 are cleared to zero. The trainof parts released by the stud 243 are motion-multiplying parts, so thata very slight movement of said stud will move the latch 252 a greaterdistance to effect the release of the frame 244e.

The zero or elimination key 214 includes a push bar 215 mounted forsliding motion adjacent the right-hand side of the plate ||5. The bar215 is formed with a bent-over foot 216 that adjustably supports atoothed plate 211. The teeth thereof, in sliding with the bar, engage atwo-way pawl 218 pivotally mounted on the plate and having apawl-centering spring 219, which enables the pawl to perform afull-stroke function relatively to the teeth of the plate 211, to insurea full movement of the error key-bar 215 in both directions.

The bar 215 is slidable between stops 280 on the bar and a xed stop 28|on the plate ||5, and is restored by a spring 292. The function of theerror-key, when depressed, is to vibrate the pinrestoring platform, andon the initial return movement thereof, to effect a cycle of the generaloperator. To this end, the bar 215 may be formed with a cam-edge 283 tolift a roll 284 secured to the upper end of a vertically-disposed bar285. having a. guiding slot through the plate I I5; while the lower freeend has a pivotal connection at 286 to the forward arm 281 of the lever|14, to rock the shaft |13 and arm |12 to raise the pin-setting platform|1| as previously described. At the end of the stroke of the key 214,the roll 284 will ride upon a flat dwell 288.

At thefextreme rear end of the bar 215 there is formed a horizontalshelf 289, supporting a tripping cam 290 fulcrumed upon a screw 29|threaded into said shelf and having a spring 292. The movement of thecam 290 is limited in two directions by a screw-and-slot connection 293.As the bar 215 nears the end of its stroke, a bent-over arm 294 of thecam 29D rides around the upper end of a lever 295 and then snaps in backof said lever, so that when the depressed key 214 is released to thecontrol of its spring 282, the arm 294 presents a cam face that willoperate the lever 295. 'Ihe lever 295, which is fulcrumed at 296 to abracket 291 secured to the plate H5, is formed with a bifurcated endthat engages a stud 298 projecting from the side of a latch-bar 299 andhaving its free end overhanging the end of a lever 309.

I ating lever V339 on the arm The relation of the arm 294 to the lever295 is such that the initial return movement of the bar 215 will slidethe latch-bar 299 longitudinally against the tension of a spring 30| torelease the lever 300 to the control of the tension of a spring 302. Thelever 300 is fulcrumed at 303 to the side plate of the base, and theforward end depresses a stud 304 at the end of a bellcrank 305 fulcrumedat 306 to said plate, and having a short arm 301 connected by a link 308pivotally connected to one arm of a bell-'crank 309. The latter ispivotally supported by a stud 3|0, While a second arm of the bell-crank309 carries a stud 3H. The link 308 carries a long stud 3|2, having itsend connected to a pull rod 3|3a connected to the motor-trippingmechanism to Abe described.

The motor may be automatically tripped by the carriage-movement in theusual manner by a lug 3 I 3 on the stop 44 (Fig/ure 2) engaging atrip-lever 3|4 to lift a pull connection 3|5 to rock a bellcrank 3I6,Figure 8, to withdraw the latch-bar 299, the bar 299 having apin-and-slot connection 3|1 to provide for an independent actuation ofthe bar by the carriage or by the error-key, as already described.

These several connections just described may be controlled by the usualmotor-starting key 3|8, which includes a vertical key-stem 3|9 lifted bya spring 320 to a stop position determined by a screw and a slot 32|.The lower end of the stem 3|9 has a horizontal arm 322 to overlie thestud 3| I, and is provided with a slot 323 to ride on the stud 3|0 andguide the lower end of the r key-stem. Depression of the key 3|8 againstthe stud 3|I rocks the bell-crank 309 and pulls the link 308 and themotor-trip connection 363iL independently of the locked lever 300.

An interlock between the error-key 214 and the motor-starting key 3|8prevents the joint operation of both keys as follows. A T-shaped shuttle324 fulcrumed upon a stud 325, threaded into the plate II5, has a spring326 effective to throw the shuttle against a stop-lug 321, see Figure 9,giving the normal position shown at Figure 8. In Figure 9 the motor-key3|8 may be depressed without interference with a leg 328 of the shuttle324; and the rocking of the bell-crank 309 shifts a square projection329 to overlie an arm 336, forming a part of the arm 281, to interceptany upward movement of the arm 281 and prevent the depression of theerror-key 214, through the inability of the cam 283 to lift the blockedroll 284.

The depression of the error-key 214 brings a projecting plate 33|,Figure 9, into contact with a cam-edge 332 of a leg 333 of the shuttle324, to vibrate the shuttle and move the leg 320 into an open slot 334in the adjoining edge o the keystem 3|9, to prevent the depression ofthe motorstarting key 8I8 until the error-key is fully restored, and thespring 326 restoresthe shuttle 324 as a Whole to its normal position.

Figure 10 shows an interlock where the oper- |80 hascycled the machine,instead of the motor-key 3|8.y The rocking of the shaft |19 rotates thecam |18, to engage the roller |11, to vibrate the arm |16 about theshaft |15, the arm |16 including a spring-arm 336, a restoring spring331 and an arm 338to engage a stud 2.81. Until the lever is restored toits dotted position, the lifting of the bar 285 by the error-key isprevented by the stud 339 engaging the cam-locked arm 338 of the arm|16. l

The subtraction-key 340 includes a sheet-metal push bar 34|, oset toform a stop-face 342 to strike a post 343 fast to the plate ||5, thepost 343 being slotted to receive the bar 34| for a sliding movement.The end of the bar 34I may be bent at right angles to provide a Wideface to be engaged by the upper end of an arm 344 spring-pressedthereagainst by a spring 345. The bar 34| may have an individualrestoring spring 346. Depression of the subtraction-key 340 operates torock a shaft 341 to withdraw a hook-arm 348 from its notch in asubtraction-setting bar :139 to release said bar to be operated by aspring 350, for subtraction-setting computation.

Another interlock prevents the joint operation of the subtraction-key340 and error-key 214, and for this purpose a bypass-bar 35| is mountedupon the plate ||5 for a crosswise longitudinal movement limited bybar-guiding and bar-stopping slots 352 engaging screws 353 threaded intothe plate. A suitable spring 354 restores the bar to normal position.Each end of the bar 35| is oiset to elevate the plane of the endsthereof to engage with beveled studs 355 and 356 on the key-bars 215 and34|, respectively. When the error-key 214 is depressed, the stud 355engages a beveled corner 351 and cams the bar to the Figure 8 position,where the stud 355 dwells upon the edge of the bar 35|, as shown, whichshifts the bar 35i against the tension of the spring 354 and wedges abeveled face 353 at the opposite end of said bar against the stud 356 onthe bar 341, and prevents the depression of the subtraction-key untilthe return of the error-key restores the bar 35i to normal position. Toprevent the springing of the bar 34| if force were applied at the lockedsubtraction-key, a barbacking upright stud 359 r'nay be fixed to theplate H5.

It will be noted at Figure 8 that the normal position of the bar 35|renders the bar operable by the error-key, and that the subtraction-key346 may be depressed without operating said bar.

The mechanism already described for shifting the transposition levers toineffective positions and for simultaneously preventing the depressionof the key-stems Milf* may be operated by carriage-return mechanism. Themechanism already describedfor returning the carriage includes thepulley 11 to drive the shaft 13. The shaft 13 rotates an eccentric 360(Figure 3) operative within a slot 36| in a lever 362 to turn the leverabout a fixed axis 363 on the frame. The free end oi the lever 362 hasthe form oi a long narrow tongue 364. As' long as the shaft 13 isrotated by the pulley 11 the lever 362 `will be rocked once for eachrevolution of the shaft. rihis lever is hooked up to certain othermechanisrn so that the latter may be actuated automatically by power torelieve the operator of the manual operation of these parts.

It will be remembered that the rocking of the shaft 63 brings the twoclutch-members 15 and 16 into a driving interlock and. closes themotorcircuit. This rocking of the shaft 63 rocks an arm 365, having astud 366 engageable Within a slot 361 of a bell-crank 363 fulcrumed at369 to the upperend of a bracket 310, secured to the machine-frame byscrews 31|. An arm 312 of the bell-crank 368 rests against a stud 313 ofa lever 314, pivoted at 315 to the upper end of a vertical bar 316. lThelever 314, through a spring 311 attached thereto, pulls the stud 313under tension against the arm 312, and when the bellcrank 368 is rockedby the arm 365, the stud. 313 will follow the arm 312 and the upperhooked end 318 will move from its normal position shown at Figure 1 tothe position of Figure 12, where the hook 318 overhangs the tongue 364of 'the lever 362; and at the first operation of the motor-driven lever362, the lever 314 and the bar 316 will be lifted to the position ofFigure 13, where a fixed stop 319 on the bar 316 will engage a notchedpawl 388, pivoted at 369 on the bracket 310 and provided with a spring38|, which is effective to hold the pawl in interlocking position underthe stop. To permit a vertical sliding movement for the bar 316, a.screw 382 passes through a slot 383 of the bracket 310.

The return of the carriage opens the clutchrnembers and 16 by therocking of the shaft 63, and the stud 366 will rock the pawl 388 fromunder the stop 319', and the arm 312 will move the lever 314 against thespring-tension of 311, and the hook 318 will be withdrawn clear of themoving tongue 364, and the bar 316 will drop by gravity, assisted by thespring 38|, until the screw 382 bottoms in the slot 383 of the bracket318, as shown at Figure 13.

In this manner the initial rotary movement of the shaft 13 lifts the bar316 and locks it in its extreme lifted position until the end of thecarriage-return cycle, and the eccentric 368 continues operating thelever 362 at each revolution thereof, but the lever 362 is ineffectiveto operate the bar 316 because the locking pawl 388 holds the bar in itsraised position above the sweep of the tongue 364.

The lower end of the bar 316 has screwed thereto an irregular extensionincluding a vertical section 384 adjustably secured to the bar by ascre'w-and-slot construction 385 and an`eccentric-connection 386,whereby the extension may be minutely adjusted up or down and secured,and also including a horizontal section 381, to offset a verticalterminal 388, that hasa stud 389 workable Within a. slot 398 in the arm|95. Said arm |95 operates the arm |94 to rock the bell-crank 2|6 withinterponent 225 between the key-locking dogs 226, and simultaneouslyrocks the shaft |88 to silence the transposition levers.,

In this manner the lifting of the bar 316 automatically locks thenumeral-keys during the carriage return.

At Figure 1, the case-shift mechanism includes a shift bar 39| uponwhich the carriage rides, the bar forming a part of a-frame 392swingable about a fulcrum-bar 394 on the frame and operated by ashift-key-lever 393. The frame 392 rocks the bar 394, which carries anarm 394 to rock vertical arm 395 of a bell-crank, the latter beingrockable upon the shaft 58 (Figure 14) to swing a horizontal arm 391,which underlies `a stud 398 projecting from the side face of the bar316, see Figures 3 and 14. This lifts said bar and operates thenumeral-key-locking interponent 225 and renders the transposition leversunable to operate the pin-bars.

It will be remembered that the tabulator-keylever 46 rocks the shaft 58by means of the universal bar 49; and in rocking a lever 399, Figure 14,which underlies the stud 398, the bar 316 is lifted to silence thetransposition levers, as already described, during the depression of thetabulatorkey.

Referring to Figures 1, 21, 22, and 23, showing the connections thatdrive the pulley |43, it will be seen that the motor-driven horizontalshaft |42 drives a vertical shaft 488 through spiral gears 48|; theshaft 488 having a bearing in the motor-casingr 82 and in the partitionwall |31.

The lower free end of the shaft 488 has pinned thereto a toothed driver408 always rotating with the shaft. Loosely mounted on the shaft 488,and held against the face of the driver 488 by a screw 482 threaded intothe shaft end, there is a carrier or crank-plate 483, having among otherthings a crank-pin 484 and a key-released pawl 485, the latter having asingle tooth 485 to be picked up by the toothed driver 488 to rotatetherewith. The pawl 485 is mounted upon a pivot-stud 486 on the carrier483, and includes a spring-stud 481, passing through a slot 488, wherethe free end is connected by a spring 489 to a post 4|8 on the carrier.The spring draws the tooth of the pawl, when released, into he path ofthe toothed driver 488.

The normal positions of the parts are shown at Figure 21 looking at theunderside of the motorcasing |08, where a hooked end 4|| of the pawl 485engages a trip pin 4|2. Normally the carrier 483 is detented by a pawl4|3, pivoted upon the partition-wall |31 at 4|4, having a V-nose 4|5 toseat in a V-recess 4|6 in an offset edge of the carrier 483, under thetension of a spring 4|1. Said offset detenting edge makes it feasible tominimize the distance the detent-pawl 4|3 is from the axis of thecrank-plate 483 and also minimizes the difculty of applying a detent tosaid crank-plate. The pawl 485 also has a stud 4|8, bearing against alever 4|9, fulcrumed at 428 to a bar of insulation 42| secured to thewall |31 by screws 422. The free end of the lever 4|9 is supported by aslot-connection with the pivotstud 4|4, and a post 423 insulated fromthe lever fiexes a spring-arm 424 to open the motor-circuit byseparating the contacts 425.

When the trip pin 4|2 is withdrawn from its pawl-holding position,Figure 21, to the position at Figure 23, in which the spring 489 hasvibrated l the pawl 485, it will be seen that the end of the slot 488has brought the tooth 485 into engagement with a tooth of the driver48811, and that simultaneously the stud 4|8 has been withdrawn torelease the lever 4|9, so that the contact-arm 424 by its resilience mayclose the contacts 425 to energize the motor 82.

The initial rotation of the motor rotates the carrier 483 to displacethe detent-pawl 4|3 and complete a cycle, when the stud 4|8 willre-engage the lever 4|9 to open the contacts 425, and the pawl 4|3 willbecome effective to arrest the rotating carrier 483. The rotation of thepawl 485 with the carrier 483 brings the hooked end 4|| into engagementwith the restored pin 4|2, to turn the pawl about its pivot-stud 486 towithdraw its tooth 485 from the toothed driver 4883.

This withdrawal of the pawl from the driver 488 may take place beforethe driver and motor have been fully silenced. The swing of the releasedpawl 4 3 may be controlled by a screw-andslot construction 4|3a.

It will be seen that the relation of the clutchpawl 485 and theswitch-device is such that when the clutch-control pin 4 |2 remainswithdrawn for repeating a cycle the switch remains closed when the pawl485 repasses the switch-lever 4| 9.

The pawl 4|3 prevents recoil of the carrier after a sudden stopping.

As a means of withdrawing the trip pin 4|2, a bracket 426 is secured tothe wall |31, and includes a hollow post 421, Figure 22, through whichthe pin 4|2 has a sliding movement. The pin 4|2 includesa head 428, tostop against the face of the bracket 426, and is slotted to pivotallyhold a lever 429, the latter having one end secured to a shaft 430 andits other end provided with a spring 43|. The shaft 430 takes a bearingin an ear 432 of the bracket 426, and the other end i takes a bearing ina bracket 433-also secured to the wall |31. The shaft 430 has acrank-arm 434, carrying a stud)435 engageable by one end of a lever 436that is fulcrumed at 431 to said bracket 433. The other end of the lever436 is connected through the link 3|3a to the motor-starting key 3|8;the pulling of the connection 3|3a effecting the withdrawal of the pin4|2 to enable the pawl 405 to be driven by its spring 409.

At the front of the computing base a snapswitch 438 is operated by alever 439, to open and close the main-line circuit.

The crank-pin 404 on the carrier 403 supports one end of a pitman 440,that extends forwardly under the computing mechanism. Its end is pro-,30 the bar 442, see Figure 5, `andthe pitman 440,

is threaded into the block 446 and provided with a check nut 441. Thecross-bar 442 has a bracket 448 secured vthereto and having bent-downears 440 with pitman-supporting lugs 450 at both edges of the pitman,that provides for a slight swing of the pitman about-the stud 44| due tothe sweep of the crank-pin 404.

The placing of the motor at the rear of the typewriting Vmachine enablesthe unit to be desk-supported, and brings the two standard registersclose together, and narrows the cornputing base to approximately thewidth ofthe typewriter..

This desk-supported machine-unit may also 45 include a fan-fold unit, asshown at Figure 24.

The motor-casing may include sockets 45| ateach side of the frame |08,to receive the ends of rods 452, that rise rearwardly, where their freeends are tied together by a platform-supporting rail 453. n The rods 452may be reinforced by tie 'bars 454, connected to the typewriter-frame.In this manner are supported a fan-fold web 455 andV carbon-feedingelements 456. At Figure l24, the upwardly projecting motor on the`base-frame is included in the perspective of this combined typewriting,computing and fan-folding machine, wholly supported by feet resting upona desk, but the motor may be omitted in some cases. V From the abovedescription it will'be noted that the present invention includes fourseparate and distinct assemblages, that may be marketed as stock unitsandvsubject to individual requisition; that these` four units include atypewriting machine, a computing mechanism, a power-driving mechanismand a fan-fold mechanism; that the typewriting machineand computingmechanism may behooked together for typing and computing, and as afinishing assembly operation, the front plate |04, the two side plates||2 and a rear cover-plate 451 'may besecured in pcsition,and thehand-lever |80 added for a manually -operated unit to jointly type andcompute; that subsequently, the motor-unit may be addedto this two-partassembled unit for a motor-driven combination; and that the fan-foldweb-support table may be joined to the two-part assembled unit or joinedto the three-part assembled unit for a full and complete. assembly,according to my invention.

The machine herein disclosed is further arranged to be automatically setfor subtraction when `the carriage enters a subtraction-zone, themechanism including a trip lever 458 having a pull link 459 connected toa bell-crank 460 operative to withdraw a latch, and release connectionseffective Vto withdraw the hook 348 from the subtraction-setting bar349. To operate the trip lever 4,58, a column-stop 44 is formed with anextension that rides over the trip lever and holds the lever in atripped position to continue the subtraction-setting of the computingmechanism throughout the computing column-zone, as shown in detail inthe O. Minton patent dated September 24, 1918, 1,280,065.`

Referring to the novel column-stop 44 and to Figure 15, it will be notedthat the regular column-stop may be a standard stock unit, and to thisstock product there may be assembled, as required, an extension 46|secured by rivets 462 entering pre-drilled holes in the stop. Thisextension 46| is aligned to trip, and passed over the lever 458to,determine the letter-space extent of the subtractive zone, asheretofore. The tripping of the lever 458 tends to lift the extension46| and rock the column-stop 44 upon the bar 42, and to prevent thisrocking strain upon the stop the extension 46| may be provided with areinforcing element that may include a nger 463 secured to the extension46| near the end thereof and parallel to the stop to pass under and abutthe under face of the stop-bar 42 and effectively resist theextension-lifting tendency of the depressible trip lever 458. Thisreinforcement of the column-stop to prevent torsional displacementthereof as a whole, is an important feature where the co-operative partsare a long connected chain of closely tted and closely adjusted parts,and where even a slight lost motion in the carriage-driven stop'44 mighttend to render the computing mechanism inaccurate.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a combined typewriting and computing machine in which a typewriteris superposed on a computing base, said machine havingcarriage-controlled denomination-selecting mechanism whichextendsdownwardly at the rear of the machine, and having indexable computingracks Within said base and extending forwardly from saiddenomination-selecting. mechanism, and also having a reciprocatorygeneral operator for said racks; the combination of a powercycling unitsupported in rear of the base as an attachment, to permit thebase to beset on a table, said unit including amotor-shaft, a counter-shaft, amovement-reducing cross-shaft connecting said shafts, said motor-shaftcarrying the rotor of an electric motor, said countershaft beingextended vertically below said crossshaft, and having an arm, and adriving pitman extending forwardly from said arm below and clear of saidrack-mechanism and having a pivotal connection at its forward end tosaid general operator.

2. In a combined typewriting and computing machine in which a typewriteris superposed on a computing base, said machine havingcarriagecontrolled denomination-selecting mechanism which extendsdownwardly at the rear of the machine, and having indexable computingracks within said base and extending forwardly from saiddenomination-selecting mechanism, and also having a reciprocatorygeneral operator for said racks; 'the combination of a power-cyclingmechanism including a shaft carrying the rotor of an electric motor, acounter-shaft, a movement-reducing cross-shaft connecting said shafts,said counter-shaft being extended vertically below said cross-shaft, andhaving an arm, and a housing incorporating said shafts, arm and motor asa unit which is supported at the rear of said base as an attachment, `topermit the base to be set on a table; and a driving pitman extendingforwardly from said arm below and clear of said rack-mechanism, andhaving a pivotal connection at its forward end to said general operator.

3. In a combined typewriting and computing machine in which a typewriteris superposed on a computing base, said machine havingca'rriage-controlled denomination-selecting mechanism which extendsdownwardly at the rear of the machine, and having indexable computingracks within said base and extending forwardly l of the rack-mechanism,and a drive-unit supported at the rear of said computing base vas anattachment, and including a drive-wrist to which the rear end of saidpitman is articulated, a motor having a rotor-shaft, adownwardly-extending counter-shaft connectible to said drivewrist, and atransverse stub-shaft having gears compounded with gears on saidrotor-shaft and 4. In a combined typewriting and computing machine inwhich a typewriter is superposed on a computing base, said typewriterhaving a carriage and carriage-return mechanism operable by a rotatableelement, said machine having carriage-controlled denomination-selectingmechanism which extends downwardly at the rear of the machine, andhaving indexable computing racks within said base and extendingforwardly from said denomination-selecting mechanism, and also having areciprocatory general operator for said racks; thecombination of apowercycling mechanism including a shaft carrying the rotor of anelectric motor, a counter-shaft, a movement-reducing cross-shaftconnecting said shafts, said counter-shaft being extended verticallybelow said cross-shaft and having an arm, and a housing incorporatingsaid shafts, arm and motor as a unit which is supported at the rear ofsaid base as an attachment, to permit the base to be set on a table,said cross-shaft being operative, through an intermediate connection, todrive' said rotatable carriage-return element; and a driving pitmanextending forwardly from said arm below and clear of the rack` themachine, and having indexable computing racks within said base andextending forwardly from said denomination-selecting mechanism, and alsohaving a reciprocatory general operator for said racks; the combinationof a powercycling unit supported in rear of the base as an attachment,to permit the base to be set on a table, said unit including amotor-shaft, a counter-shaft, a movement-reducing cross-shaft connectingsaid shafts, said motor-shaft carrying the rotor of an electric motor,said counter-shaft being extended vertically below said cross-shaft, andhaving an arm, and a driving pitman extending forwardly from said armbelow and clear` of said rack-mechanism and having a pivotal connectionat its forward end to said general operator, said general operator beingin the form of a bar extending transversely of the computing base toengage said racks, and forming a part of a carriage mounted for forwardand backward movement, said carriage having below said transverse bar a.bridge to which the forward end of said pitman is pivoted, therebyenabling the pitman to clear said rack-mechanism.

6. In combination; a machine comprising a typewriter and anadding-mechanism-incorporat ing base upon which the typewriter ismounted, said adding base being constructed to rest upon and whollyabove the top of a desk and having operative indexing connections withsaid typewriter, said base including an operator movable forward andback within the base for cycling the adding mechanism; a motor-mechanismappurtenant to said cycling operator, but embodied as a unitary head atthe back of the machine, and entirely above the top of 'the desk, saidhead comprising a mount forming a rearward extension of the framework ofthe machine, an electric motor supported above the desk-top by saidmount and having a drive-shaft extending downwardly, a vertical drivenshaft connected by gearing to said drive-shaft and extending downwardlytoward the top of the desk, a crank at the lower end of said drivenshaft, and a cyclingclutch mechanism operable for enabling said verticaldriven shaft to cycle said crank, said vertical driven shaft, gearing,clutch-mechanism and crank being incorporated with said mount and motor;and a pitman pivoted to said crank and extending forwardly from saidhead and beneath said adding base and above the top of the desk andconnected at its forward end to said cycling operator.

7. In combination; a machine comprising a typewriter and anadding-mechanism-incorporating base upon which the typewriter ismounted, said adding base being constructed to rest upon and whollyabove the top of a desk and having operative indexing connections withsaid typewriter, said base including an operator movable forward andback within the base for cycling the adding mechanism; a motor-mechanismappurtenant to said cycling operatorl but embodied as a unitary head atthe back of the machine. and entirely above the top of the desk, saidhead comprising a mount forming a rearward extension of the framework ofthe machine, an electric motor supported above the desk-top by saidmount and having a drive-shaft extending downwardly, a vertical drivenshaft extending downwardly toward the top of the desk, a crank at thelower end of said driven shaft, a cyclingclutch mechanism operable forenabling said vertical driven shaft to cycle said crank, and atransverse driven shaft, said vertical and trans- ACl verse drivenshafts being driven by means of gearing by said motor-drive shaft, saiddriven shafts, gearing, clutch-mechanism and crank being incorporatedwith said mount and motor, and said transverse shaft having means fordriving a certain shaft included in said typewriter; and a pitmanpivoted to said crank and extending forwardly from said head and beneathsaid addupon and wholly above the top of a desk and having operativeindexing connections w`lth said typewriter, said base including anoperator movable forward and back within the base for cycling the addingmechanism; a motor-mechanism ap-y purtenant to said cycling operator,but embodied as a unitary head at theback of the machine, and entirelyabove the top of the desk, said head comprising an electric motor havinga driveshaft, a mount attached to the frame of the machine at the backof the latter and supporting said motor-above the top of the desk, acrank, and means, including clutch-mechanism, whereby the motor-driveshaft is operable to cycle 'said crank, said means and crank beingincorporated with said mount and motor, with the crank working in ahorizontal plane proximate to the level of the under side of said addingbase; and a pitman pivoted to said crank and extending forwardly fromsaid head and beneath said adding base and above the top of the desk andconnected at its forward end to said cycling operator.

9. In combination; a machine comprising a typewriter and anadding-mechanism-incorporating base upon which the typewriter ismounted, said adding base being constructed to rest upon and Whollyabove the top of a desk and having operative indexing connections withsaid typewriten'said base including an operator movable forward andAback within the base for cycling the adding mechanism; amotor-mechanism appurtenant to said cycling operator, but embodied as aunitary head at the back of the machine,

` and entirely above the top of the desk, said head 4driven shaft, and acycling-clutch mechanism operable for enabling said train of shafts tocycle said crank, said vertical driven shaft,`gear-shaft,clutch-mechanism and crank being incorporated with said mount and motor;and a pitman pivotedto said crankand extending forwardly from said headand beneath said adding base and conf nected at its forward end to saidcycling operator.

10. In combination; a machine comprising a 4typewriter and anadding-mechanism-incorporating base upon which the typewriter ismounted, said adding base being constructed to rest upon and Whollyabove the' top of a desk and having operative indexing connections withsaid typewriter, said base including an operator movable forward andback within the base for cycling the adding mechanism; a motor-mechanismappurtenant to said cycling operator, but embodied as a unitary head atthe back of the machine, and entirely above the top of the desk, saidhead comprising a mount forming a rearward extension of the framework ofthe machine, an electric motor supported above the desk-surface by saidmount and having la downwardly-extending drive-shaft, a vertical drivenshaft connected by reduction gearing to said drive-shaft and extendingdownwardly toward the top of the desk, a crank at the lower end of saiddriven shaft, and a cycling-clutch mechanism operable for enabling saidvertical driven shaft to cycle said crank, said driven shaft, reductiongearing, clutch-mechanism and crank being incorporated with said mountand motor; and a pitman pivoted to said crank and extending forwardlyfrom Asaid head and beneath the adding base and above the top of thedesk and connected at its forward end to said cycling operator.

11. In combination; a machine comprising a typewriter and anadding-mechanism-incorporating base upon rwhich the typewriter ismountupon and wholly above the top of a desk and having operativeindexing-connections with said typewriter, said base including anoperator movable forward and back within the base for cycling the addingmechanism; a motor-mechanism appurtenant to said cycling operator, butembodied as a unitary head at the back of the machine, and entirelyabove the top of the desk, said head comprising an electric motor, amount attached to the frameV of said adding base and arranged to supportsaid motor above the desk and behind the machine, a crank incorporatedwith said mount to work in a horizontal plane which is proximate to thelevel of the under side of said adding base, and connections,incorporated with said mount and including a cycling clutch andmotor-switch mechanism, whereby said motor is enabled to cycle saidcrank and is correspondingly-started and stopped; and a pitman pivotedto said crank and extending forwardly from said head and beneath theadding base and above the top of the desk and connected at its forwardend to said cycling operator.

l2. In combination; a machine comprising a typewriter and anadding-mechanism-incorporating base upon which the typewriter ismounted, said adding base being constructed to rest upon and whollyabove the top of a desk and having operative indexing connections withsaid typewriter, said base including an adding-mechanism-spanningcarriage movable forward and back within said base for cyclingsaid'adding mechanism; a motor mechanism appurtenant to said cyclingcarriage, but embodied as a unitary head at the back of the machine andentirely above the top of the desk, said head incorporating a motor, acrank disposed by means of said head to operate in a horizontal planeproximate to the level of the underside of said adding base, and means,including clutch mechanism, enabling said motor to cycle said crank; anda pitman pivoted to said crank and extending forwardly from said headand beneath said adding base and above Athe top of the desk andconnected at its forward end to a transverse bridge provided in saidcycling carriage.

13. In combination; a machine comprising a typewriter and anadding-rnechanism-incorporating base on which the typewriter is mounted,said adding base constructed to rest upon and Wholly above the top of adesk, said base having ed, said adding base being constructed to restback within the adding base to cycle the adding mechanism; a motormechanism appurtenant to 'said operator, -but embodied as a unitary headin the form of a rearward extension of said machine and entirely abovethe top of the desk, said head incorporating an overhead motor fromwhich extends downwardly a drive-shaft, a transverse shaft operative forreturning the carriage of the typewriter, and geared, below the motor,

to said motor-drive shaft. a vertical clutch-shaft geared to saidtransverse shaft and extending downwardly therefrom toward the top ofthe desk, and having at its lower end a.' clutch, and a crankconnectible by said clutch to said verticalshaft; and a pitman pivotedto said crank beneath said motor-head and extending forwardly from thelatter and beneath said adding base and above the top of the desk, andat its forward end connected to said cycling operator.

O'I'IO THIEME.

